Indian & World Geography·Policy Changes
Landforms and their Evolution — Policy Changes
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Version 1Updated 7 Mar 2026
| Entry | Year | Description | Impact |
|---|---|---|---|
| N/A (Adaptation: Shift from Catastrophism to Uniformitarianism) | Late 18th - Early 19th Century | The dominant view of Earth's history shifted from Catastrophism (belief that Earth's features were formed by sudden, violent, short-lived events) to Uniformitarianism (the present is the key to the past, emphasizing slow, gradual processes over vast timescales). | This conceptual shift laid the philosophical foundation for modern geomorphology, allowing for the scientific study of landform evolution based on observable processes and the recognition of deep time. |
| N/A (Adaptation: Davisian Cycle of Erosion) | Late 19th Century | W.M. Davis proposed the 'Geographical Cycle' or 'Cycle of Erosion,' a systematic model suggesting that landscapes evolve through sequential stages of youth, maturity, and old age, driven by the interplay of structure, process, and stage. | Provided the first comprehensive theoretical framework for landform evolution, introducing key concepts and terminology, despite later criticisms regarding its deterministic and time-dependent nature. |
| N/A (Adaptation: Plate Tectonics Revolution) | Mid-20th Century (1960s) | The development and acceptance of the Theory of Plate Tectonics, integrating concepts of continental drift, seafloor spreading, and subduction, provided a unifying framework for understanding large-scale Earth processes. | Revolutionized geomorphology by explaining the origin of major primary and secondary landforms (mountains, rift valleys, ocean basins) as a direct consequence of lithospheric plate movements, linking endogenic forces to global relief patterns. |
| N/A (Adaptation: Dynamic Equilibrium and Process Geomorphology) | Mid-20th Century onwards | A move away from purely historical, sequential models towards process-oriented studies, emphasizing dynamic equilibrium, threshold concepts, and quantitative analysis of geomorphic processes. | Led to a more nuanced understanding of how landscapes respond to environmental changes, focusing on the balance between forces and resistance, and the role of feedback mechanisms in shaping landforms. |